package _3登录例子;
import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@WebServlet("/loginchk")
public class LoginCheckServlet extends HttpServlet 
{
	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		
		// HttpServletRequest req 
		// Tomcat自动创建的对象，会把用户的请求信息放入
		
//		HttpServletResponse resp
		// Tomcat自动创建的对象, 通过它给用户发信息
		
		// 1. 获取用户提交的参数
		String username = req.getParameter("username");
		String password = req.getParameter("password");
		
		
		// 2. 判断
		// 3. 显示结果
		if(("zhangsan".equals(username)&&"123456".equals(password))||
			("lisi".equals(username)&&"123456".equals(password))	
				)
		{
//			resp.getWriter().print("Login OK");
			
			// 保存登录信息
			HttpSession session = req.getSession();
			session.setAttribute("username", username);
			// 注意: 如果是项目中，则将查询到的User对象放入Session
			
			// 跳转首页
			resp.sendRedirect("index");
			
		}
		else
		{
//			resp.getWriter().print("Login fail");
			
			// 跳转到登录也
			resp.sendRedirect("login.html");
		}
		
		
	
		
		
	}
	

}